Chase G Mayers

Recent Ph.D. Graduate

As of September 2018, I am an NSF Postdoctoral Fellow at Cornell University in the Pawlowska lab.

Ph.D. Research

As part of the Harrington lab (2012–2018), I studied the evolutionary history and systematics of the obligate fungal symbionts of ambrosia beetles. Ambrosia beetles have special organs called mycangia that they use to carry spores of their special cultivar, much like a bag of seeds carried by a farmer. The fungi have been domesticated as tended crops by the beetles over a long, shared evolutionary history; their nutrient-rich spores are the beetles' sole food source, but do not have the ability to disperse on their own, completely relying on the beetles' mycangia for transport. This is an impressive example of insect agriculture with more than a century of research behind it, but molecular methods have revolutionized our understanding of the diversity present in the fungal symbionts.

My specific goals were, briefly:

  1. To map the diversity of ambrosia fungi cultivated by a diverse array of beetle hosts worldwide;
  2. To relate the pattern of diversity and lineage of these fungi to the same in their hosts;
  3. To trace the history of evolution of mycangia and the fungi they carry in both time and space; and
  4. To increase awareness of this fascinating model symbiosis.

My focus was especially on genera in the family Ceratocystidaceae such as Ambrosiella, Phialophoropsis, and Meredithiella. I was especially interested in the correlation between the evolutionary history of these fungi and that of the different types of mycangia they are stored in. I sought to establish an accurate taxonomy of ambrosia fungi that is both phylogenetically accurate and comprehensive in representing the symbionts of many of the currently-known ambrosia beetle lineages.

I defended and submitted my dissertation in April 2018. As of June 2018, three of the five chapters were published (see 'Publications' section below).

My broad interests include teaching, mycology, bioinformatics, molecular phylogenetics, and systematics.


American Society for Microbiology
Mycological Society of America
Society of Systematic Biologists
ISU Microbiology Graduate Student Organization
ISU Plant Pathology Graduate Student Organization


See Google Scholar profileResearchGate profile, or the updated CV attached below for an updated list of publications.

Area of Expertise: 
Molecular Phylogenetics
B.S., Microbiology, Louisiana State University, 2012
Ph.D., Microbiology, Iowa State University, 2018